Novel active copper-phosphorus brazing alloy

Abstract

The invention relates to a novel active copper-phosphorus brazing alloy, belonging to a medium-temperature brazing material. Currently, no copper-phosphorus brazing alloy with reasonable formulation design, low price and high performance-price ratio is presented. The novel active copper-phosphorus brazing alloy comprises the following components by weight percent: 1-3.5% of Ag, 6.0-7.5% of P, 0.5-2.5% of Sn, 0.1-1.5% of Ni, 0.1-2.0% of Sb, 0.01-0.5% of Zr and balance of Cu. The novel active copper-phosphorus brazing alloy has the advantages of reasonable formulation design, low price, high performance-price ratio, low melting temperature and good wettability, flowability and plasticity, can be processed to be a welding wire with the minimum diameter of 0.5mm, a welding ring with the minimum inner diameter of 3.0mm and a thin strip with the minimum thickness of 0.1mm and can be widely used for resistance brazing, flame brazing and high-frequency induction brazing in industries of refrigeration, machinery, electromechanics, electrical appliances and valve fittings.

Description

technical field [0001] The invention relates to a brazing filler metal, in particular to an active copper-phosphorus brazing filler metal, which is suitable for brazing of copper and copper alloy, copper and carbon steel, copper and nickel-plated and galvanized Bondi tubes, and can be widely used in refrigeration Resistance brazing, flame brazing and high-frequency induction brazing in industries such as machinery, electromechanical, electrical appliances, valve fittings, etc. are medium temperature brazing materials. Background technique [0002] In recent years, with the improvement of living standards, the demand for electrical appliances represented by air conditioners, refrigerators, and home appliances has gradually increased, and the demand for brazing materials for valve fittings and compressor pipelines has also increased. BCu80PAg with a silver content of 15%, BCu75PAg with a silver content of 20%, and other copper-phosphorus solders are widely used in the welding...

AI Technical Summary

Problems solved by technology

[0005] In summary, there is no copper with reasonable formula design, low price, high cost performance, low melting temperature, good wettability, fluidity and plasticity Phosphorus solder

The melting temperature of the existing high-silver copper-phosphorus solder is too high, the temperature range between the solidus line and the liquidus line is too large, the silver content is too high, the production and use costs are high, and the plasticity is poor, so it is difficult to process it into a solder with a minimum diameter of 0.5mm. Welding wire, welding rings with a minimum inner diameter of 3.0mm and thin strips with a minimum thickness of 0.1mm cannot be used in the brazing of copper and carbon steel, copper and nickel-plated and galvanized Bondi tubes, and the applicable surface is narrow, which hinders development in the field of brazing

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